Discover the system requirements for your server
SpawnShield requires at least 256Mb dedicated to SpawnShield in order to render it. The background is explained on the Understand how SpawnShield works page.
We generally recommend our users to allocate 1GB to their server so that there is no lack of resources. In the case of a lack of resources, SpawnShield tries to do as little work as possible so that the server is not impacted by it.
Please see the Get help to improve plugin performance page in case a performance problem occurs.